Acoustical treatment After-treatment 1 Architectural acoustics 1 Perceptual evaluation 1 Reverberation 1 Reverberation time 1 Room acoustic modeling 1 Room acoustics 1 Speech communication 1 Speech transmission 1 Speech transmission index 1 Wright-Patterson Air Force Base 1 air force 1 article 1 computer simulation 1 human 1 human experiment 1 speech 1